Mold and mold equipment.



V T. J. MELL. IOLD AND HOLD EQUIPMENT. AIPLIGATIOI FILM) AUG. 15, 1908.

Patented Dea 8, 1908. 3 832311-4832! 1.

T. J. HELL. HOLD m HOLD EQUIPIEHT. Arrmoumr nun me. 15. 1m.

906,256. Patented Dec. s, 1908.

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UNITED Sunnis PAinnrr TOD J. HELL, OF YOUNGSTOWN, OHIO, ASSIGNOR TO THE REPUBLIC RUBBER COHPhNY, YGUNGSTCWN, OHIO, A CORPORATION OF OHIO.

HOLD AND HOLD EQUIPMENT.

Specification of Letters Patent.

Patented n. a, race.

Application filed August 16, 1908. Serial R0. 448,898.

To all whom it may concern:

Be it known that I, Ton J. MELL, a citizen of the United States, residing at Youngstown, in the county of Mahoning and State of Ohio, have invented certain new and useful Improvements in Molds and Mole. Equipment; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to molding apparatus, or the art of forming or sha in articles of merchandise in separable fiasxs, ut has ref erence more particularly to the molds and mold equipment em loved in the manufacture of elastic vehic e-tires or other rubber goods of like character.

This vention has for its object, among others, the production of molds of greater general efliciency than those heretofore employed for similar purposes; molds capable of imparting to articles formed therein a lon git-udinai as well as transverse ressure; molds which are peculiarly ada te and ar ranged for the release of artic es manufactured therein; and molds the structural arrangement whereof insures the atest stability, certainty of action, anf c lurability, economy in the mold equipment, and a consequent economy of storage space required in the factory.

In the accompanying drawings which form part of this a plication. and illustrate, for exam le, a mo (1 and the mold er uipment for manu acturing automobile or ot er resilient tires: Figure 1 is an interior plan view of one mold member, Fig. 2 represents the same with a transversely divided tread-ring resting therein, Fig. 3 is a fragmentary transverse sectional view through two cooperating mold members, and an intervening tread-ring sec 3 tion. 4 is a perspective view of one trcadi ring section detached. Fig. 5 is a vertical transverse section through both mold momhere inuncdiatcl v before rlu in". sin-win" also I a P P a tread-ring. a tire, and the mm upon hich it wasslmpe-d. H2. 3 is also a vertical 'f cated in dotted lines, during the process of molding.

Reference being had to the drawings and numerals thereon, 1 indicates the lower and 2 the upper cooperating metallic mold mm cc bers of ordinary exterior configuration, provided with the usual circum erential boltlugs 3 to facilitate securing them together. These members 1 and 2 are perforated at suitable points, as at 4, by outlet vents for 66 the escape of any so lus rubber durin the process of molding; w do the interior 0 said members, which are counterparts one of the other, are each configured by a tread-rin or matrix-seat havin a conical outer We 5, 70 and a horizontal epression 6. Within the seat aforesaid is located a tread-ring or matrix 7, wh'ch ma com rise a unit; a nulus, may be divided in one or more p anes mumferentially, may be divided at three or more points transversely or ma be divided both circumferentially and transversely without departing from the spirit of the present invention. In either event, however, said matrix is provided with a conical outer edge 8 designed, arranged and ads ted to mate with the aforesaid conical wal s 5 of the mold members. It is further provided with opposing horizontal edges 9, 9

aving surface grooves 10 therein for purposes that will ater appear, and its inner curved face 1 1 is configured by a counterpart of the design which is to be imparted to the tread surface of a tire or other article in the course of manufacture.

The accompanying illustrations exemplify the present invent-ion in its a )plicability to the manufacture of automobile tires having tread-surfaces configured by a multiplicity of independent elongated studs, circumfercntially arranged in arallel lanes; and to this end the concave ace 11 o the tread-ring or matrix 7 is indented by suitable depressions 12, each vented outwardly as at 13 to permit theescapc of air from said depressions during the process and operation of molding. Moreover. the tread-ring or matrix herein shown, for exit-mph, is divided transversely, a at 14, into three or more segmental sections 7. 7', 7", to facilitate the process of trend-ring. and Fig. 5 is n diugmnnual ic view showing portions-of lu'o mold nu-mlu-rs m the act of closing upon a tread-ring section or '55 matrix to advance same radially, as indimolding, and also that of removing the completed time from themold, as will later appear. I

Adjapfifll'l to the tread-ring or matrix 7 when its horizontal edges 9 are properly seated in their corresponding depressions 6, the mold members 1 and 2 are each configured by an annular concavity 15 which forms the sides 16 of the molded tire; while adjacentto this in each of said members 1 and 2, another circular indentation 17 provides similarly for the clencher beads 18 of the tire, and a circular radial de nession 19, half in the mold member 1 and half in the member 2, receives the web 20 of an annular core 21 upon which the superstructure of the tire is originally built.

This being a description of my invention in its preferred construction and arrangement of parts, I will now proceed to describe its mode of operation when a segmental with elongated studs upon their tread surfaces as shown.

A tire having been roughly shaped in the usual manner upon the annular core 2], is

first introduced into one mold member 1 simultaneously with a cotnplete surrounding 'segmentalmatrix 7, 7, 7 as indicated by 25 Fig. 2, its lower outer conical edge 8 engaging the correspondingly angled conical wall 5 of the mold member. At this stage the matrix 7 is held oil and prevented from seatim itself by a surplus of rubber in the untinishc tire, as shown by Fig. 5; and, the upper mold member 2 next being lowered into place, 011- gages by its corneal outer wall 5 the upper 5 cortical edge 8 of the segmental matrix 7 as also clearly shown by Figs. 5, 6, 7 and N. The mold members may now be secured together by bolts (not'shown) engaging bolt are vented by way of the individual outlets 13 as the rubber enters; and all su lus material over and above that required or a tire in the course of formation finds its way between the adjacent surfaces of mold inembets], 2 and the co-aeting matrix 7, to the horizontal grooves it) in the latter. These grooves 10 in turn conduct the surplus rubber to the perforations 4 by which it is permit-ted to escape.

In addition to the functions heretofore ascribed to the conical arrangement and nested relation of the mold walls 5 and the outer edge of matrix 7, there will be noted the no less important function of safeguarding the said matrix from undue strain during the tread-ring is emploved for producing tires closing of mold members 1 and 2 upon it. In other words, the said contacting surfaces 5 and 7 at all times have a plain parallel bearing which uniformly distributes the pressure over the outer edge of the matrix, as distinguished from structures in which the matrix has a convex outer edge and the mold members a corresponding concave outer wall, and in which the innermost advance edges of the mold members first engage the matrix at a single point with full pressure, thus subjecting the matrix to a serious cracking strain.

What has been said of the preferred form ofconstruction is in a measure true of mdifications which employ eircumfcr'entiallv divided tread-rings rather than segmental, for the purpose of iuamtfacturing tires with comparatively shallow treadsurface corru alugs I, in the usual manner for the purpose of securing all parts in their proper relative po- 1 sition until such time as the tinal molding 4O pressure 1S applied.

the art, the mold and its contents are next tions, or a plain trend as represented by Big. 7. This figure shows a tread-ring formed 1n two corresponding circumferentially divided sections I 7 which may be readily sepa- 7 rated when the mold is opened to release the As is well understood by those skilled in subjected to a suitable degree of heat, durmg the process of curing, tor the purpose of 45 reducin the roughly shaped tire to a proper state oi plasticity. any approved manner, hydraulic or other pressure, is applied to the co-acting mold members 1 and 2 thereby closin them as in- 80 dicated by Fig. 6. Asa result, the segmental 1 matrix 7, 7,

t is contracted diametrically, or, in other words. advanced radially as best shown by diagrammatic Fig. 8, from its original position to that indicated by dotted 55 lines in said figure. Thus. in addition in the usual transverse pressure, the tire is compressed radially, upon its tread-surface or= oint of greatest strain, to materiallyincrt-nse its durability and decrease its liability to 0 punctures, this same pressure serving to till the de )ressions 12 in the tread-ring or segmenta. matrix 7 ant. product.- the surface studs 22 shown by 6 of the drawings. During the formation of said surface studs 22 6 it will be apparent that the depressions 12 com leted tire or the said matrix may again divided as indicated bv the dotted lines I, a: when arranged for eep corrugations; and in like manner various changes and alterations may be made in the parts herein 'llns accomplished, 111' shown and described without departing from the invention which will now be set forth in the following claims.

I claim 1. In an annular mold the combination 115 with oppositely a ed mold members, of an interior matrix sai members and matrix having co-ae-ting inclined faces.

2. In an annular mold the combination with (o-acting mold members having an interior matrix-seat with inclined outer walls, of a matrix having its periphery formed with corr nnding inclines.

3. n a mold the combination with cut-act ing mold uremia-rs; cat-.lq'having an interior matrix-seat with conical outer walls, of a matrix having a conical outer edge corresponding with said outer walls.

4. In a mold the combination with co-acting mold members each having an interior 13!! lion with vii-acting mnld mvnilmrslvavh ha\'- in;' an intvrinr -at ,=ul' a trvad-ring dividvd transversely and prnridr-d \rilh a ('nnh'ul Huh-r snrfar-v.

T. in an annular nmld l'nr vvhivlv tin- Hur-umhinatiun with mantra-part nudd "WHI- bars, of a segmental tread-ring, and means \vhvreby said tread-ring is contracted ant-nnmlirally during the prom-5s of whirling.

8. In an annular mnld fur vrhivlv tires the jmmhinal'iun with r-mmlcr mrt mold Invinhorn each having a lrvad-ring seal, uf a s0gmental trvml-rin; adaplrd to engage huth of said seals, and nun-ma \rhorch said treadring is rontractwl autmimtirallr during the |)I'()(PSS uf molding.

ln tmtimuny \vhvrvul' l allix in signature, in pros-mm of hm .-lli). '4'l'il)l1lg \YIUHSSPS.

'IUl) J. HELL.

\Yit m'ssvs:

J. l. Mchmrmc.

Fun J. Ham. 

